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Old 08-17-2001, 09:03 AM
Southern_Son
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Actually, I chronographed the speed with the mile markers on the Interstate. Take the number of seconds that it requires to travel between two mile markers and divide that into 3600.

After realizing the difference, I got my handheld GPS receiver that I used to use in my airplane and stuck it to the windshield. It confirmed what I had noticed by the 'timing marker' method.
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